Mobile app store is a type of digital distribution platform for mobile apps. It provides developers and providers with a place wherein publications of their apps are made possible and accessible by worldwide customers.

App stores typically take the form of an online store, through which users can browse vast categories of different apps, view specific information about and of each app (such as reviews or ratings), and acquire the app (including app purchase, if necessary - many apps are offered at no cost). Acquisition of the app is registered upon download of the selected app; installation of selected app happens automatically thereafter. Some app stores may also include a system to automatically remove an installed program from devices under certain conditions, with the goal of protecting the user against malicious software.

Many app stores are curated by their owners, requiring that submissions of prospective apps go through an approval process. These apps are inspected for compliance with certain guidelines (such as those for quality control and censorship), including the requirement that a commission be collected on each sale of a paid app. With the ease of use apps offer, and their presence on most mobile devices, app stores rose to prominence at the beginning of the 21st century with their adoption of iOS (App Store (iOS)) and Android (Google Play). Similar systems for the distribution of apps written for other operating systems have also been available for some time (particularly Linux distributions since the early 1990s), through package management systems and their graphical front-ends.